/* Generated by tools/fonts.py — do not edit by hand. */
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@font-face{font-family:'IBM Plex Mono';font-style:normal;font-weight:400;font-display:swap;src:url('/assets/fonts/ibm-plex-mono-400.woff2') format('woff2')}
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@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:400;font-display:swap;unicode-range:U+914D, U+91CC-91CD, U+91CF, U+94AE, U+952E, U+957F, U+95ED-95EE, U+95F4, U+9605, U+9636, U+9644-9645, U+9650, U+9664, U+968F-9690, U+96C6, U+9700, U+9762, U+9875-9876, U+9879-987A, U+9884, U+9891, U+9898, U+989C, U+9988, U+9996, U+9A8C, U+9AA4, U+9ED8, U+FF08-FF09, U+FF0C, U+FF1A-FF1B, U+FF1F;src:url('/assets/fonts/noto-sans-sc-400-2.woff2') format('woff2')}
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@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:500;font-display:swap;unicode-range:U+6392, U+63D0, U+63D2, U+64CD, U+652F, U+6536, U+6539, U+653E, U+6548, U+654F, U+6570, U+6574, U+6587, U+6599, U+65AD, U+65B0, U+65B9, U+65BD, U+65E0, U+65E5, U+65E7, U+65F6, U+660E, U+6620, U+662F, U+663E, U+666F, U+6697, U+66F4, U+66FF-6700, U+6708-6709, U+670D, U+672A, U+672C, U+673A, U+6743, U+6761, U+677F, U+6784, U+67B6, U+67E5, U+6807, U+680F, U+6821, U+6837-6838, U+683C, U+6846, U+684C, U+6863, U+68C0, U+6982, U+6A21, U+6A59, U+6B21, U+6B47, U+6B63-6B65, U+6BB5, U+6BCF, U+6C42, U+6C47, U+6CA1, U+6CBF, U+6D45, U+6D4B, U+6D4F, U+6D88, U+6DB5, U+6DF1, U+6DFB, U+6E05, U+6E90, U+6F14, U+706F-7070, U+70B9, U+7136, U+7167, U+7247-7248, U+724C, U+72B6, U+72EC, U+7387, U+73AF-73B0, U+7406, U+751F, U+7528, U+7531, U+753B, U+754C, U+7559, U+767D, U+7684, U+76D6, U+76EE, U+76F8, U+770B, U+771F, U+7801, U+7814, U+786E, U+793A, U+79BB, U+79CD, U+79FB, U+7A0B, U+7A3F, U+7A7A, U+7A84, U+7A97, U+7ACB, U+7AD9, U+7AEF, U+7B14, U+7B2C, U+7B49, U+7B7E, U+7B80, U+7B97, U+7BA1, U+7C3F, U+7CFB, U+7EAA, U+7EBF, U+7EC4, U+7EC6, U+7EC8, U+7ECD, U+7ED3, U+7EDF, U+7EE7, U+7EED, U+7EFF, U+7F16, U+7F18, U+7F29, U+7F51, U+7F6E, U+7F72, U+7FFB, U+80CC, U+80FD, U+8131, U+81EA, U+81F4, U+8272, U+8282, U+82F1, U+8303, U+83DC, U+84DD, U+85CF, U+878D, U+884C, U+8868, U+88C5, U+8981, U+8986, U+89C1-89C2, U+89C6, U+89C8, U+89D2, U+89E3, U+8A00, U+8BA1, U+8BA4, U+8BAE, U+8BB0, U+8BB8, U+8BBE, U+8BC1, U+8BC4, U+8BCA, U+8BD1, U+8BD5, U+8BDD, U+8BE2, U+8BED, U+8BF4, U+8BF7, U+8BFB, U+8C03, U+8D1F, U+8D23, U+8D26, U+8D39, U+8D44, U+8DB3, U+8DDF, U+8DE8, U+8DEF, U+8DF3, U+8EAB, U+8F7D, U+8F93, U+8FB9, U+8FC7, U+8FD0-8FD1, U+8FD4, U+8FD8-8FD9, U+8FDB, U+8FF0, U+9000, U+9002, U+9009, U+901A, U+9047, U+9053, U+90AE, U+90E8, U+90FD;src:url('/assets/fonts/noto-sans-sc-500-1.woff2') format('woff2')}
@font-face{font-family:'Noto Sans SC';font-style:normal;font-weight:500;font-display:swap;unicode-range:U+914D, U+91CC-91CD, U+91CF, U+94AE, U+952E, U+957F, U+95ED-95EE, U+95F4, U+9605, U+9636, U+9644-9645, U+9650, U+9664, U+968F-9690, U+96C6, U+9700, U+9762, U+9875-9876, U+9879-987A, U+9884, U+9891, U+9898, U+989C, U+9988, U+9996, U+9A8C, U+9AA4, U+9ED8, U+FF08-FF09, U+FF0C, U+FF1A-FF1B, U+FF1F;src:url('/assets/fonts/noto-sans-sc-500-2.woff2') format('woff2')}

/* ============================================================
   openOfficeTab — editorial spec-sheet design
   Paper ground, serif display, hairline structure, real captures.
   ============================================================ */

/* Fonts are generated into fonts.css by tools/fonts.py and prepended at build. */

/* ------------------------------- Tokens ------------------------------- */
:root {
  /* Palette sampled from the management center: cool light surfaces, one blue accent. */
  --paper: #f5f8fd;
  --paper-hi: #ffffff;
  --paper-lo: #e2ebf8;
  --ink: #131c2b;
  --ink-2: #36475d;
  --ink-3: #5c6f88;
  --rule: #d6e1f0;
  --rule-soft: #e5ecf6;
  --accent: #1a66e0;
  --accent-2: #104fbd;
  --dark: #0b1523;
  --dark-2: #101d2e;
  --dark-text: #edf3fa;
  --dark-muted: #94a7be;
  --dark-rule: rgba(237, 243, 250, 0.15);

  --word: #185abd;
  --excel: #107c41;
  --powerpoint: #c43e1c;

  --serif: 'Instrument Serif', 'Noto Serif SC', 'Songti SC', Georgia, serif;
  --sans: 'Instrument Sans', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;

  --wrap: 1180px;
  --gut: 36px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Paper grain: keeps large flat areas from looking like a browser default. */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  opacity: 0.42;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='0.22'/%3E%3C/svg%3E");
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

::selection {
  background: var(--ink);
  color: var(--paper);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 12px;
}

/* ------------------------------- Layout ------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gut);
}

.band {
  padding-block: clamp(58px, 6.6vw, 94px);
}
.band--dark {
  background: var(--dark);
  color: var(--dark-text);
}


/* Widow control: `pretty` for running text, `balance` for short blocks that
   would otherwise leave one or two words on their own line. */
p,
li,
dd {
  text-wrap: pretty;
}
.lede,
.dl-note,
.head__note,
.feat-item p,
.faq-a,
.center-cap span,
.step p,
.release li {
  text-wrap: balance;
}

/* ------------------------------ Type bits ------------------------------ */
.mono {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: 1.4;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.9rem, 6.05vw, 5.15rem);
  line-height: 0.95;
  letter-spacing: -0.019em;
  color: var(--ink);
  text-wrap: balance;
}

.h1 span {
  display: block;
}

.lede {
  font-size: 1.0625rem;
  line-height: 1.68;
  color: var(--ink-2);
  max-width: 46ch;
}

.h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.95rem, 3.4vw, 3.05rem);
  line-height: 1.03;
  letter-spacing: -0.016em;
  text-wrap: balance;
  max-width: 20ch;
}

html[lang='zh-CN'] .h1 {
  font-size: clamp(2.35rem, 5.1vw, 4.35rem);
  line-height: 1.18;
  letter-spacing: 0.005em;
}
html[lang='zh-CN'] .h2 {
  font-size: clamp(1.55rem, 2.55vw, 2.2rem);
  line-height: 1.35;
  letter-spacing: 0.01em;
}
html[lang='zh-CN'] body,
html[lang='zh-CN'] .lede {
  line-height: 1.85;
}

/* Chinese runs wider per character than Latin: measures set in `ch` cut lines
   far too early. Use em-based measures and ask the browser to avoid orphans. */
html[lang='zh-CN'] .lede {
  max-width: 28em;
}
html[lang='zh-CN'] .hero-lede {
  max-width: 26em;
}
html[lang='zh-CN'] .h2 {
  max-width: 22em;
}
html[lang='zh-CN'] .head__note {
  max-width: 19em;
}
html[lang='zh-CN'] .dl-note {
  max-width: 26em;
}
html[lang='zh-CN'] .faq-a {
  max-width: 38em;
}
html[lang='zh-CN'] .foot-tag {
  max-width: 18em;
}
html[lang='zh-CN'] .feat-item p {
  max-width: 22em;
}

/* ------------------------------- Header ------------------------------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: color-mix(in srgb, var(--paper) 84%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.masthead.is-stuck {
  border-bottom-color: var(--rule);
  background: var(--paper);
}
@supports (backdrop-filter: blur(1px)) {
  .masthead {
    backdrop-filter: blur(14px) saturate(1.05);
  }
}

.masthead-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.008em;
  color: var(--ink);
  flex: none;
}
.brand img {
  width: 24px;
  height: 24px;
}
.brand:hover {
  color: var(--accent-2);
}

.nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
}
.nav a {
  position: relative;
  font-size: 13.5px;
  color: var(--ink-2);
  padding-block: 6px;
  transition: color 0.2s;
}
.nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.nav a:hover {
  color: var(--ink);
}
.nav a:hover::after,
.nav a[aria-current='true']::after {
  transform: scaleX(1);
}
.nav a[aria-current='true'] {
  color: var(--ink);
}

.masthead-tools {
  display: flex;
  align-items: center;
  gap: 18px;
  flex: none;
}

/* language disclosure */
.lang {
  position: relative;
}
.lang > summary {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  list-style: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: 6px 0;
  transition: color 0.2s;
}
.lang > summary::-webkit-details-marker {
  display: none;
}
.lang > summary:hover,
.lang[open] > summary {
  color: var(--ink);
}
.lang > summary::after {
  content: '';
  width: 5px;
  height: 5px;
  border-right: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.25s;
}
.lang[open] > summary::after {
  transform: rotate(225deg) translateY(-2px);
}
.lang-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  min-width: 178px;
  padding: 6px;
  background: var(--paper-hi);
  border: 1px solid var(--rule);
  border-radius: 3px;
  box-shadow: 0 26px 44px -32px rgba(13, 26, 45, 0.45), 0 2px 6px -4px rgba(20, 19, 15, 0.2);
}
.lang-menu a,
.lang-menu button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--ink-2);
  border-radius: 2px;
}
.lang-menu a:hover,
.lang-menu button:hover {
  background: var(--paper);
  color: var(--ink);
}
.lang-menu [aria-current='true'] {
  color: var(--ink);
  font-weight: 500;
}

/* buttons */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-bd: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  height: 46px;
  padding-inline: 18px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: 2px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.003em;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
}
.btn svg {
  flex: none;
  transition: transform 0.3s var(--ease);
}
.btn:hover svg {
  transform: translate(3px, -3px);
}
.btn--primary {
  --btn-bg: var(--accent);
  --btn-fg: #ffffff;
}
.btn--primary:hover {
  --btn-bg: var(--accent-2);
}
.btn--line {
  --btn-bd: var(--rule);
  color: var(--ink);
}
.btn--line:hover {
  --btn-bd: var(--ink);
  background: var(--paper-hi);
}
.btn--sm {
  height: 36px;
  padding-inline: 14px;
  font-size: 13px;
}
.btn--invert {
  --btn-bg: var(--dark-text);
  --btn-fg: var(--dark);
}
.btn--invert:hover {
  --btn-bg: #ffffff;
}
.btn--ghost {
  --btn-bd: var(--dark-rule);
  color: var(--dark-text);
}
.btn--ghost:hover {
  --btn-bd: rgba(241, 237, 225, 0.44);
}
.btn--block {
  width: 100%;
  justify-content: space-between;
}

/* -------------------------------- Hero -------------------------------- */
.hero {
  padding-top: clamp(26px, 3vw, 38px);
  padding-bottom: clamp(44px, 5.4vw, 74px);
}
.hero-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.hero-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: clamp(32px, 4.4vw, 62px);
  align-items: center;
  padding-top: clamp(22px, 2.6vw, 34px);
}
.hero-head .h1 {
  font-size: clamp(2.7rem, 4.9vw, 4.55rem);
}
html[lang='zh-CN'] .hero-head .h1 {
  font-size: clamp(2.2rem, 4.45vw, 3.9rem);
}
.hero-aside {
  padding-bottom: 0;
}
.hero-lede {
  max-width: 34em;
  margin-bottom: 20px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}
.hero-meta {
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  transition: border-color 0.25s, color 0.25s;
}
.text-link:hover {
  border-color: var(--ink);
}
.text-link svg {
  transition: transform 0.3s var(--ease);
}
.text-link:hover svg {
  transform: translate(2px, -2px);
}

/* the live product sits in the first screen */
.hero .preview {
  margin-top: clamp(24px, 2.6vw, 32px);
}
.hero .pv-canvas,
.hero .pv-doc {
  min-height: 280px;
}
.hero .pv-paper {
  padding: 26px 120px 34px;
}
.hero .pv-paper-lead {
  max-width: none;
  font-size: 13.5px;
}
.hero .pv-paper h3 {
  font-size: 1.75rem;
}
html[lang='zh-CN'] .hero .pv-paper h3 {
  font-size: 1.5rem;
}
.hero .pv-ribbon {
  height: 40px;
  font-size: 12px;
  gap: 17px;
}
.hero .pv-format {
  height: 34px;
}
.hero .pv-app {
  font-size: 12px;
}
.hero .pv-tab {
  height: 34px;
  font-size: 11px;
}
.hero .pv-paper-list li {
  font-size: 13px;
}
.hero .pv-sheet {
  min-height: 280px;
}
.hero .pv-slide {
  aspect-ratio: 16 / 6.4;
}
.hero-note {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: clamp(16px, 1.8vw, 24px);
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
}
.hero-note .pv-dot {
  flex: none;
}

/* appearance spec table */
.spec-table {
  margin: clamp(26px, 3vw, 38px) 0 0;
  border-top: 1px solid var(--rule);
}
.spec-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 40px;
  padding: 15px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.spec-row dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 3px;
}
.spec-row dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink);
  text-align: right;
}

/* ------------------------------- Figures ------------------------------- */
.fig {
  margin: 0;
}
.fig-frame {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.7) inset, 0 40px 60px -52px rgba(13, 26, 45, 0.45),
    0 6px 16px -14px rgba(13, 26, 45, 0.3);
}
.fig-frame img {
  width: 100%;
}

/* ------------------------------ Section head ------------------------------ */
.head {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 244px;
  gap: 48px;
  align-items: start;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}
.head__n {
  position: absolute;
  left: -86px;
  top: 26px;
  width: 60px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.head__note {
  font-size: 13px;
  line-height: 1.62;
  color: var(--ink-3);
  max-width: 32ch;
  padding-top: 8px;
}
.band--dark .head {
  border-top-color: var(--dark-rule);
}
.band--dark .head__n {
  color: #7fb2ff;
}
.band--dark .head__note {
  color: var(--dark-muted);
}
.band--dark .h2 {
  color: var(--dark-text);
}

/* -------------------------------- Features -------------------------------- */
.feat {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: clamp(40px, 6vw, 84px);
  margin-top: clamp(34px, 4vw, 52px);
}
.feat-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  padding: 24px 0 28px;
  border-top: 1px solid var(--rule-soft);
}
.feat-item:nth-child(1),
.feat-item:nth-child(2) {
  border-top-color: var(--rule);
}
.feat-idx {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  padding-top: 5px;
}
.feat-item h3 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.004em;
  margin-bottom: 7px;
}
.feat-item p {
  font-size: 0.9375rem;
  line-height: 1.66;
  color: var(--ink-2);
  max-width: 38ch;
}
html[lang='zh-CN'] .feat-item p {
  line-height: 1.8;
}

/* --------------------- management center row --------------------- */
.center-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 22px);
  margin-top: clamp(28px, 3.4vw, 42px);
}
.center-shot {
  display: block;
  text-align: left;
}
.center-shot .fig-frame {
  display: grid;
  place-items: center;
  aspect-ratio: 1.13;
  overflow: hidden;
  border-radius: 4px;
  transition: border-color 0.25s, transform 0.4s var(--ease), box-shadow 0.4s;
}
.center-shot img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.center-shot:hover .fig-frame {
  border-color: rgba(13, 26, 45, 0.28);
  transform: translateY(-2px);
  box-shadow: 0 30px 44px -40px rgba(13, 26, 45, 0.55), 0 4px 12px -10px rgba(13, 26, 45, 0.3);
}
.center-cap {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}
.center-cap b {
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink);
}
.center-cap span {
  font-size: 12px;
  line-height: 1.45;
  color: var(--ink-3);
}
.center-note {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: right;
}

/* --------------------- interactive product preview --------------------- */
.preview {
  --pv-bg: #ffffff;
  --pv-strip: #efefef;
  --pv-shell: #f3f3f3;
  --pv-line: #d5d5d5;
  --pv-line-strong: #bfc6d0;
  --pv-text: #131c2b;
  --pv-muted: #62748c;
  --tab-strip: #efefef;
  --tab-active: #ffffff;
  --tab-panel-active: #ededed;
  --tab-border: #d5d5d5;
  --tab-text: #323232;
  --tab-hover: #e8e8e8;
  --tab-accent: var(--word);
  border: 1px solid var(--rule);
  border-radius: 5px;
  background: var(--pv-shell);
  overflow: hidden;
  box-shadow: 0 40px 60px -52px rgba(13, 26, 45, 0.45), 0 6px 16px -14px rgba(13, 26, 45, 0.28);
  transition: background 0.35s, border-color 0.35s;
}
.preview[data-theme='dark'] {
  --tab-strip: #262626;
  --tab-active: #323232;
  --tab-panel-active: #3a3a3a;
  --tab-border: #505050;
  --tab-text: #ebebeb;
  --tab-hover: #414141;
}
.preview[data-app='excel'] { --tab-accent: var(--excel); }
.preview[data-app='powerpoint'] { --tab-accent: var(--powerpoint); }
.preview[data-theme='dark'][data-app='word'] { --tab-accent: #70a6f2; }
.preview[data-theme='dark'][data-app='excel'] { --tab-accent: #5bbe89; }
.preview[data-theme='dark'][data-app='powerpoint'] { --tab-accent: #f08d6b; }

.pv-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--pv-line);
}
.pv-apps {
  display: flex;
  gap: 2px;
}
.source-icon { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; flex-shrink: 0; color: var(--ink); }
.source-icon:hover { color: var(--accent); }
.pv-app {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 9px;
  border-radius: 3px;
  border: 1px solid transparent;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--pv-muted);
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}
.pv-app:hover {
  color: var(--pv-text);
}
.pv-app.is-on {
  background: var(--pv-bg);
  border-color: var(--pv-line-strong);
  color: var(--pv-text);
}
.pv-code {
  display: grid;
  place-items: center;
  width: 16px;
  height: 16px;
  border-radius: 2px;
  background: var(--c);
  color: #fff;
  font-family: var(--mono);
  font-size: 9px;
}
.pv-hint {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--pv-muted);
  white-space: nowrap;
}
.pv-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.tip {
  position: relative;
  display: inline-flex;
  margin-left: 2px;
}
.tip-btn {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid var(--pv-line-strong);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1;
  color: var(--pv-muted);
  transition: color 0.2s, border-color 0.2s;
}
.tip-btn:hover,
.tip:focus-within .tip-btn {
  color: var(--pv-text);
  border-color: var(--pv-muted);
}
.tip-body {
  position: absolute;
  right: -6px;
  top: calc(100% + 9px);
  z-index: 6;
  width: 216px;
  padding: 8px 10px;
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper-hi);
  font-family: var(--sans);
  font-size: 11.5px;
  line-height: 1.55;
  letter-spacing: 0;
  text-transform: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-3px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.tip:hover .tip-body,
.tip:focus-within .tip-body {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.pv-window {
  background: var(--pv-bg);
  overflow: hidden;
  font-family: 'Segoe UI', 'Microsoft YaHei UI', sans-serif;
}
.pv-titlebar { display: flex; align-items: center; gap: 9px; height: 38px; padding-inline: 14px; background: #f0f0f0; font-size: 12px; color: #323232; }
.pv-titlebar [data-window-title] { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pv-window-buttons { margin-left: auto; color: #627080; flex-shrink: 0; }
.pv-command-ribbon { display: flex; padding: 7px 4px 3px; border-bottom: 1px solid var(--pv-line); background: #fff; overflow-x: auto; scrollbar-width: thin; }
.pv-command-group { display: flex; flex: none; flex-direction: column; gap: 4px; padding: 0 10px; border-right: 1px solid var(--pv-line); font-size: 10.5px; color: #323232; }
.pv-command-group:last-child { border-right: 0; }
.pv-command-group .pv-command-label { margin-top: auto; text-align: center; color: #666; font-size: 10px; }
.pv-command-items { display: flex; gap: 5px; min-height: 69px; }
.pv-command-small { display: grid; grid-auto-flow: column; grid-template-rows: repeat(3, 23px); column-gap: 7px; }
.pv-command { display: flex; align-items: center; gap: 5px; padding: 2px 4px; color: inherit; font: inherit; text-align: left; white-space: nowrap; border: 1px solid transparent; border-radius: 2px; scroll-margin-block: 100px; }
.pv-command:hover { background: #e9f1fc; border-color: #b2c9e8; }
.pv-command svg { flex: none; width: 15px; height: 15px; color: #4c6178; }
.pv-command--large { flex-direction: column; justify-content: flex-start; gap: 3px; width: 62px; white-space: normal; text-align: center; line-height: 1.3; }
.pv-command--large svg { width: 29px; height: 29px; margin-top: 3px; }
.pv-ribbon {
  display: flex;
  align-items: stretch;
  gap: 15px;
  padding: 0 12px;
  height: 36px;
  border-bottom: 1px solid var(--pv-line);
  font-size: 11.5px;
  color: var(--pv-muted);
  overflow: hidden;
}
.pv-appname {
  display: inline-flex;
  align-items: center;
  padding-right: 12px;
  margin-right: 1px;
  border-right: 1px solid var(--pv-line);
  color: var(--pv-text);
  font-weight: 500;
}
.pv-menu {
  display: inline-flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.pv-menu.is-on {
  color: var(--pv-text);
  font-weight: 500;
  border-bottom-color: var(--accent);
}
.pv-format {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 32px;
  padding: 0 12px;
  border-bottom: 1px solid var(--pv-line);
  background: color-mix(in srgb, var(--pv-strip) 55%, var(--pv-bg));
  overflow: hidden;
}
.pv-field {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 19px;
  padding: 0 7px;
  border: 1px solid var(--pv-line);
  border-radius: 2px;
  background: var(--pv-bg);
  font-size: 10px;
  color: var(--pv-text);
  white-space: nowrap;
}
.pv-field--sm {
  min-width: 26px;
}
.pv-tools {
  display: inline-flex;
  gap: 7px;
  font-size: 10.5px;
  color: var(--pv-muted);
  padding-left: 2px;
}
.pv-tools b {
  font-weight: 700;
}
.pv-tools i {
  font-style: italic;
}
.pv-tools u {
  text-decoration: underline;
}
.pv-styles {
  display: inline-flex;
  gap: 10px;
  font-size: 10.5px;
  color: var(--pv-muted);
  white-space: nowrap;
}

.pv-tabbar {
  display: flex;
  align-items: stretch;
  padding-inline: 8px;
  background: var(--tab-strip);
  border-bottom: 1px solid var(--tab-border);
  border-radius: 8px;
  position: relative;
}
.pv-tabs {
  display: flex;
  gap: 3px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  padding: 4px 0 0;
  min-width: 0;
  max-width: calc(100% - 90px);
  isolation: isolate;
}
.pv-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 80px;
  flex: 0 0 var(--demo-tab-width, 120px);
  width: var(--demo-tab-width, 120px);
  height: 34px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-bottom: 0;
  border-radius: 3px 3px 0 0;
  font-family: inherit;
  font-size: 10.5px;
  letter-spacing: 0.005em;
  color: var(--tab-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}
.pv-tab:hover {
  background: var(--tab-hover);
}
.pv-tab > span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pv-tab.is-on {
  background: var(--tab-active);
  border-color: var(--tab-border);
  color: var(--tab-text);
  position: relative;
  top: 1px;
  z-index: 1;
}
.pv-tab.is-on::after { content: ''; position: absolute; top: 1px; left: 8px; right: 8px; height: 2px; background: var(--tab-accent); border-radius: 2px; }
.preview[data-accent='bottom'] .pv-tab.is-on::after { top: auto; bottom: 1px; }
.preview[data-accent='none'] .pv-tab.is-on::after { display: none; }
.pv-tab-actions { display: flex; align-items: center; flex: 0 0 90px; }
.pv-action-wrap { position: relative; display: flex; }
.pv-tab-action { display: grid; place-items: center; width: 30px; height: 30px; color: var(--tab-text); border-radius: 4px; font: 18px/1 'Segoe UI', sans-serif; }
.pv-tab-action:hover, .pv-tab-action[aria-expanded='true'] { background: var(--tab-hover); }
.pv-tab:not(.is-on), .pv-tab-action { color: var(--demo-custom-text, var(--tab-text)); }
.pv-action-tip { display: none; position: absolute; z-index: 5; bottom: calc(100% + 7px); right: 0; width: max-content; max-width: 210px; padding: 5px 9px; background: #fff; color: #222; border: 1px solid #ccc; border-radius: 3px; box-shadow: 0 3px 10px #0002; font: 12px/1.4 'Segoe UI', 'Microsoft YaHei UI', sans-serif; pointer-events: none; }
.pv-action-wrap:hover .pv-action-tip, .pv-action-wrap:focus-within .pv-action-tip { display: block; }
.pv-body { display: flex; flex-direction: column; }
.preview[data-position='bottom'] .pv-tabbar { order: 2; }
.preview[data-visible='false'] .pv-tabbar, .pv-tabbar[data-auto-hidden='true'] { display: none; }
.pv-popup { position: fixed; inset: auto; margin: 0; width: max-content; min-width: 170px; max-width: calc(100vw - 16px); max-height: calc(100dvh - 24px); padding: 3px; overflow: auto; border: 1px solid #b5b5b5; border-radius: 3px; background: #f9f9f9; color: #222; box-shadow: 3px 5px 16px #0003; font: 12px/1.4 'Segoe UI', 'Microsoft YaHei UI', sans-serif; }
.pv-popup button { display: grid; grid-template-columns: 18px minmax(0,1fr) 12px; align-items: center; gap: 6px; width: 100%; min-height: 27px; padding: 4px 6px; border: 1px solid transparent; border-radius: 2px; text-align: left; font: inherit; color: inherit; }
.pv-popup button:hover, .pv-popup button:focus { outline: none; border-color: #a8c6e5; background: #dfecfa; }
.pv-popup button > span:nth-child(2) { overflow-wrap: anywhere; }
.pv-popup hr { margin: 3px 4px 3px 28px; height: 0; border: 0; border-top: 1px solid #ddd; }
.pv-menu-check { text-align: center; }
.pv-dialog { width: min(440px, calc(100vw - 32px)); margin: auto; padding: 22px; border: 1px solid #bac2cc; border-radius: 6px; background: #f9f9f9; color: #222; box-shadow: 0 16px 65px #0003; font: 14px/1.5 'Segoe UI', 'Microsoft YaHei UI', sans-serif; }
.pv-dialog::backdrop { background: #131c2b40; }
.pv-dialog h3 { font: 600 17px/1.4 'Segoe UI', 'Microsoft YaHei UI', sans-serif; margin-bottom: 18px; }
.pv-dialog label { display: block; margin: 14px 0 6px; }
.pv-dialog input, .pv-dialog select { width: 100%; min-width: 0; padding: 8px; border: 1px solid #b6bec8; border-radius: 3px; background: #fff; color: #222; font: inherit; }
.pv-dialog-actions { display: flex; justify-content: flex-end; gap: 9px; margin-top: 22px; }
.pv-dialog-actions button { min-width: 75px; padding: 7px 14px; border: 1px solid #bac2cc; background: #fff; border-radius: 3px; font: inherit; }
.pv-dialog-actions button[type='submit'] { background: var(--accent); border-color: var(--accent); color: #fff; }
.pv-dialog-error { color: #a82929; margin-top: 10px; }
.pv-dialog [data-preview-color] p { margin-top: 10px; font-size: 12px; color: #555; }

.pv-canvas {
  position: relative;
  padding: 16px;
  min-height: 258px;
  background: #e9e9e9;
}
.pv-body[data-app-panel='excel'] .pv-canvas { padding: 0; background: #fff; }
.pv-doc {
  position: relative;
  min-height: 258px;
}

.pv-paper {
  padding: 20px 24px 34px;
  max-width: 860px;
  margin-inline: auto;
  background: #fff;
}
.pv-paper-path {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--pv-muted);
}
.pv-paper h3 {
  margin-top: 10px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.15;
  letter-spacing: -0.012em;
  color: var(--pv-text);
}
.pv-paper-meta {
  margin-top: 4px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pv-muted);
}
.pv-paper-lead {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.62;
  color: var(--pv-text);
  opacity: 0.82;
  max-width: 46ch;
}
.pv-paper-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.pv-paper-list li {
  position: relative;
  padding-left: 14px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--pv-text);
  opacity: 0.9;
}
.pv-paper-list li::before {
  content: '';
  position: absolute;
  left: 1px;
  top: 0.68em;
  width: 4px;
  height: 1px;
  background: var(--pv-muted);
}
.pv-folio {
  position: absolute;
  right: 20px;
  bottom: 12px;
  font-family: var(--mono);
  font-size: 9px;
  color: var(--pv-muted);
  opacity: 0.8;
}

.pv-sheet {
  display: flex;
  flex-direction: column;
  min-height: 258px;
}
.pv-formula {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-bottom: 1px solid var(--pv-line);
  background: var(--pv-strip);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--pv-text);
}
.pv-fx {
  font-style: italic;
  font-size: 9.5px;
  color: var(--pv-muted);
}
.pv-grid {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  font-size: 11.5px;
  color: var(--pv-text);
}
.pv-grid th {
  padding: 6px 10px;
  border-bottom: 1px solid var(--pv-line);
  border-right: 1px solid var(--pv-line);
  background: color-mix(in srgb, var(--excel) 7%, transparent);
  font-family: var(--mono);
  font-size: 8.5px;
  font-weight: 400;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--excel) 72%, var(--pv-text));
  text-align: left;
}
.pv-grid th:last-child,
.pv-grid td:last-child {
  border-right: 0;
}
.pv-grid td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--pv-line);
  border-right: 1px solid var(--pv-line);
}
.pv-grid td.num {
  text-align: right;
  font-family: var(--mono);
  font-size: 10.5px;
}
.pv-grid tr.is-total td {
  font-weight: 500;
  border-top: 1px solid var(--pv-line-strong);
}
.pv-sheet-fill {
  flex: 1;
  min-height: 22px;
  opacity: 0.55;
  background-image: linear-gradient(var(--pv-line) 1px, transparent 1px);
  background-size: 100% 24px;
}
.pv-sheetbar {
  display: flex;
  gap: 12px;
  margin-top: auto;
  padding: 5px 12px;
  border-top: 1px solid var(--pv-line);
  background: var(--pv-strip);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  color: var(--pv-muted);
}
.pv-sheetbar .is-on {
  color: var(--pv-text);
  border-bottom: 2px solid var(--excel);
}

.pv-deck {
  position: relative;
  padding: 18px 20px 30px;
}
.pv-slide {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  aspect-ratio: 16 / 7.4;
  padding: 18px;
  border: 1px solid var(--pv-line);
  border-radius: 2px;
  background: color-mix(in srgb, var(--pv-strip) 40%, var(--pv-bg));
  text-align: center;
}
.pv-kicker {
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pv-muted);
}
.pv-slide h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.65rem;
  line-height: 1.15;
  letter-spacing: -0.012em;
  color: var(--pv-text);
  max-width: 22ch;
}
.pv-slide-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 18px;
  font-size: 11px;
  color: var(--pv-muted);
}
html[lang='zh-CN'] .pv-paper h3 {
  font-size: 1.3rem;
  line-height: 1.35;
}
html[lang='zh-CN'] .pv-slide h3 {
  font-size: 1.45rem;
  line-height: 1.35;
}

.preview[data-shape='separate'] .pv-tabbar {
  padding-bottom: 4px;
  border-bottom: 1px solid transparent;
  box-shadow: 0 1px 2px #0002;
}
.preview[data-shape='separate'] .pv-tab { height: 30px; border-radius: 8px; }
.hero .preview[data-shape='separate'] .pv-tab { height: 30px; }
.preview[data-shape='separate'] .pv-tab.is-on {
  top: 0;
  background: var(--tab-panel-active);
  border: 1px solid var(--tab-border);
}

.pv-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-top: 1px solid var(--pv-line);
  background: var(--pv-shell);
}
.pv-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pv-muted);
}
.pv-seg {
  display: flex;
  gap: 4px;
}
.pv-seg button {
  padding: 5px 10px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 11px;
  color: var(--pv-muted);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.pv-seg button:hover {
  color: var(--pv-text);
}
.pv-seg button.is-on {
  background: var(--pv-bg);
  border-color: var(--pv-line-strong);
  color: var(--pv-text);
  box-shadow: 0 1px 2px rgba(13, 26, 45, 0.07);
}
.pv-theme {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  border: 1px solid var(--pv-line);
  border-radius: 3px;
  background: var(--pv-bg);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--pv-muted);
  transition: color 0.2s, border-color 0.2s;
}
.pv-theme:hover {
  color: var(--pv-text);
  border-color: var(--pv-line-strong);
}
.pv-ico {
  flex: none;
}

/* -------------------------------- Download -------------------------------- */
.dl {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(36px, 6vw, 80px);
  margin-top: clamp(34px, 4.2vw, 54px);
  align-items: start;
}
.dl-table {
  margin: 0;
  border-top: 1px solid var(--dark-rule);
}
.dl-row {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: 20px;
  padding: 13px 0;
  border-bottom: 1px solid var(--dark-rule);
}
.dl-row dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--dark-muted);
  padding-top: 3px;
}
.dl-row dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.01em;
  color: var(--dark-text);
  word-break: break-word;
}
.dl-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.dl-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 14px;
}
.dl-links a {
  font-size: 12.5px;
  color: var(--dark-muted);
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.dl-links a:hover {
  color: var(--dark-text);
  border-bottom-color: rgba(241, 237, 225, 0.5);
}
.dl-note {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--dark-rule);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--dark-muted);
  max-width: 42ch;
}

/* -------------------------------- Steps -------------------------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(34px, 4vw, 50px);
  border-top: 1px solid var(--rule);
}
.step {
  padding: 22px 26px 4px 0;
}
.step + .step {
  border-left: 1px solid var(--rule-soft);
  padding-left: 26px;
}
.step-num {
  font-family: var(--serif);
  font-size: 2rem;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 14px;
}
html[lang='zh-CN'] .step-num {
  font-family: var(--mono);
  font-size: 1rem;
  letter-spacing: 0.06em;
}
.step h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.step p {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-3);
}
.steps-foot {
  margin-top: 30px;
}

/* --------------------------------- FAQ --------------------------------- */
.faq {
  margin-top: clamp(30px, 3.6vw, 44px);
  border-top: 1px solid var(--rule);
}
.faq details {
  border-bottom: 1px solid var(--rule-soft);
}
.faq summary {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20px;
  gap: 24px;
  align-items: baseline;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.003em;
  transition: color 0.2s;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary:hover {
  color: var(--accent-2);
}
.faq summary::after {
  content: '+';
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 400;
  color: var(--ink-3);
  justify-self: end;
  line-height: 1;
}
.faq details[open] summary::after {
  content: '−';
}
.faq-n {
  position: absolute;
  left: -54px;
  top: 23px;
  width: 36px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  font-weight: 400;
}
.faq-a {
  padding: 0 60px 26px 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 74ch;
}
html[lang='zh-CN'] .faq-a {
  line-height: 1.9;
}
.faq-foot {
  margin-top: 22px;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

/* -------------------------------- Footer -------------------------------- */
.foot {
  border-top: 1px solid var(--rule);
  padding-top: clamp(40px, 5vw, 64px);
  padding-bottom: 30px;
}
.foot-mark {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 8.4vw, 7.2rem);
  line-height: 0.9;
  letter-spacing: -0.035em;
  color: var(--ink);
  display: block;
  margin-bottom: clamp(26px, 3.4vw, 44px);
}
html[lang='zh-CN'] .foot-mark {
  letter-spacing: -0.01em;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, minmax(0, 1fr));
  gap: 32px;
  padding-bottom: 40px;
}
.foot-tag {
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--ink-3);
  max-width: 26ch;
}
.foot-col h4 {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 12px;
}
.foot-col a {
  display: block;
  font-size: 13.5px;
  color: var(--ink-2);
  padding: 4px 0;
  transition: color 0.2s;
}
.foot-col a:hover {
  color: var(--accent-2);
}
.foot-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: var(--ink-3);
}
.foot-bottom a {
  color: inherit;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.foot-bottom a:hover {
  color: var(--ink);
  border-bottom-color: var(--rule);
}
.foot-bottom a:hover {
  color: var(--ink);
}

/* ------------------------------- Guide ------------------------------- */
.page-head {
  padding-top: clamp(36px, 4.4vw, 56px);
  padding-bottom: clamp(34px, 4vw, 52px);
}
.page-head .eyebrow {
  display: block;
  margin-bottom: 18px;
}
.page-head .h1 {
  font-size: clamp(2.4rem, 4.6vw, 3.9rem);
}
html[lang='zh-CN'] .page-head .h1 {
  font-size: clamp(2rem, 3.7vw, 3.1rem);
}
.page-head .lede {
  margin-top: 20px;
}
.crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.crumbs a:hover {
  color: var(--ink);
}

.doc {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: clamp(40px, 6vw, 90px);
  padding-bottom: clamp(56px, 7vw, 96px);
}
.toc {
  position: sticky;
  top: 96px;
  align-self: start;
}
.toc-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 10px;
}
.toc a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 6px;
  padding: 7px 0;
  font-size: 13px;
  color: var(--ink-3);
  transition: color 0.2s;
}
.toc a span:first-child {
  font-family: var(--mono);
  font-size: 10px;
  padding-top: 3px;
  opacity: 0.75;
}
.toc a:hover,
.toc a.is-active {
  color: var(--ink);
}
.doc-body {
  max-width: 680px;
}
.doc-section {
  padding-top: 26px;
  border-top: 1px solid var(--rule);
  margin-bottom: clamp(38px, 4.4vw, 54px);
  scroll-margin-top: 96px;
}
.doc-section:first-child {
  border-top: 0;
  padding-top: 0;
}
.doc-section h2 {
  position: relative;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.2vw, 1.95rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 18px;
}
html[lang='zh-CN'] .doc-section h2 {
  font-size: clamp(1.3rem, 1.9vw, 1.6rem);
  letter-spacing: 0.01em;
}
.doc-section h2 .n {
  position: absolute;
  left: -54px;
  top: 9px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}
.doc-section p {
  font-size: 0.9688rem;
  line-height: 1.74;
  color: var(--ink-2);
}
html[lang='zh-CN'] .doc-section p {
  line-height: 1.92;
}
.doc-section p + p {
  margin-top: 14px;
}
.doc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.code {
  position: relative;
  margin-top: 20px;
  background: var(--dark);
  color: var(--dark-text);
  border-radius: 3px;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 16px;
}
.code code {
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--dark-text);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}
.copy {
  flex: none;
  align-self: center;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dark-muted);
  border: 1px solid var(--dark-rule);
  border-radius: 2px;
  padding: 7px 10px;
  transition: color 0.2s, border-color 0.2s;
}
.copy:hover {
  color: var(--dark-text);
  border-color: rgba(241, 237, 225, 0.45);
}
.copy-status {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--accent-2);
  min-height: 1em;
}
.doc-note {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-3);
}

/* screenshots grid */
.shots {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 26px;
}
.shot {
  display: block;
  text-align: left;
  width: 100%;
  padding: 0;
}
.shot .fig-frame {
  display: block;
  overflow: hidden;
  transition: border-color 0.25s;
}
.shot .fig-frame img {
  width: 100%;
  height: auto;
}
.shot:hover .fig-frame {
  border-color: rgba(13, 26, 45, 0.3);
}
.shot-cap {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 9px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.shot-cap b {
  font-weight: 500;
  color: var(--ink);
}

/* dialog */
.lightbox {
  border: 0;
  padding: 0;
  background: transparent;
  max-width: min(1180px, 94vw);
  width: 100%;
  color: var(--paper);
}
.lightbox::backdrop {
  background: rgba(8, 15, 26, 0.84);
  backdrop-filter: blur(4px);
}
.lightbox-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.lightbox img {
  width: 100%;
  border-radius: 3px;
  border: 1px solid rgba(241, 237, 225, 0.2);
  background: #fff;
}
.lightbox-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(241, 237, 225, 0.7);
}
.lightbox-bar button {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(241, 237, 225, 0.8);
  border: 1px solid rgba(241, 237, 225, 0.28);
  border-radius: 2px;
  padding: 6px 10px;
}
.lightbox-bar button:hover {
  color: #fff;
  border-color: rgba(241, 237, 225, 0.6);
}
.lightbox-error {
  font-size: 13px;
  color: rgba(241, 237, 225, 0.8);
}

/* ------------------------------- Releases ------------------------------- */
.timeline {
  border-top: 1px solid var(--rule);
}
.release {
  display: grid;
  grid-template-columns: 54px 190px minmax(0, 1fr);
  gap: 36px;
  padding: 30px 0 34px;
  border-bottom: 1px solid var(--rule-soft);
}
.release-v {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink);
  padding-top: 5px;
}
.release-date {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  padding-top: 6px;
  text-transform: uppercase;
}
.release h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.35rem, 2vw, 1.7rem);
  line-height: 1.2;
  letter-spacing: -0.008em;
  margin-bottom: 12px;
}
html[lang='zh-CN'] .release h2 {
  font-size: clamp(1.2rem, 1.7vw, 1.45rem);
  line-height: 1.5;
  letter-spacing: 0.01em;
}
.release li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9375rem;
  line-height: 1.68;
  color: var(--ink-2);
  max-width: 62ch;
}
html[lang='zh-CN'] .release li {
  line-height: 1.85;
}
.release li + li {
  margin-top: 6px;
}
.release li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--ink-3);
}
.releases-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 30px;
}

/* --------------------------------- 404 --------------------------------- */
.notfound {
  min-height: 62vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: clamp(60px, 9vw, 120px);
}
.notfound .code {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  background: none;
  padding: 0;
  margin-bottom: 18px;
  display: block;
}
.notfound h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(3rem, 7vw, 5.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}
.notfound-actions {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-top: 30px;
}

/* Mobile navigation disclosure (hidden above 760px) */
.mobile-nav {
  display: none;
  position: relative;
}
.mobile-nav > summary {
  list-style: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding: 8px 0;
}
.mobile-nav > summary::-webkit-details-marker {
  display: none;
}
.mobile-panel {
  position: absolute;
  right: -12px;
  top: calc(100% + 14px);
  min-width: 210px;
  padding: 10px 8px;
  background: var(--paper-hi);
  border: 1px solid var(--rule);
  border-radius: 3px;
  box-shadow: 0 26px 44px -32px rgba(13, 26, 45, 0.45);
}
.mobile-panel a {
  display: block;
  padding: 9px 10px;
  font-size: 14px;
  color: var(--ink-2);
}
.mobile-panel a:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ------------------------------- Motion ------------------------------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  transition-delay: var(--d, 0ms);
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn svg,
  .nav a::after {
    transition: none;
  }
}

/* ------------------------------ Responsive ------------------------------ */
@media (max-width: 1180px) {
  .head__n {
    position: static;
    width: auto;
    margin-bottom: 10px;
  }
  .head {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
}

@media (max-width: 1080px) {
  .center-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .head__note {
    padding-top: 14px;
    max-width: 46ch;
  }
  .dl,
  .dl {
    gap: 32px;
  }
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .step:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }
  .step:nth-child(3),
  .step:nth-child(4) {
    border-top: 1px solid var(--rule-soft);
  }
  .step:nth-child(-n + 2) {
    padding-top: 22px;
  }
  .release {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 20px;
  }
  .release-date {
    grid-column: 2;
    order: -1;
    padding-top: 0;
    padding-bottom: 4px;
  }
  .release h2,
  .release ul {
    grid-column: 2;
  }
}

@media (max-width: 900px) {
  .hero-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }
  .hero-lede {
    margin-bottom: 20px;
  }
  .doc {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
  .toc {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 2px 18px;
    border-top: 1px solid var(--rule);
    padding-top: 12px;
  }
  .toc-label {
    grid-column: 1 / -1;
    border-bottom: 0;
    padding-bottom: 6px;
    margin-bottom: 0;
  }
  .foot-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 24px;
  }
  .foot-tag {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .pv-bar { gap: 6px; padding: 6px; flex-wrap: wrap; }
  .pv-apps { min-width: 0; flex: 1; }
  .hero .pv-app { font-size: 10.5px; padding: 5px 6px; gap: 5px; }
  .pv-hint-label { display: inline; }
  .pv-hint { font-size: 9px; letter-spacing: .03em; }
  .pv-bar .pv-apps { flex: 1 0 auto; }
  .pv-ribbon .pv-menu:not(.is-on):nth-of-type(n+4) { display: none; }
  .pv-command-group { padding-inline: 8px; font-size: 10px; }
  :root {
    --gut: 22px;
  }
  .pv-ribbon {
    gap: 11px;
    padding-inline: 11px;
    font-size: 10.5px;
  }
  .pv-dot {
    display: none;
  }
  .pv-hint {
    font-size: 8.5px;
    letter-spacing: 0.06em;
  }
  .pv-canvas,
  .pv-doc,
  .hero .pv-canvas,
  .hero .pv-doc,
  .hero .pv-sheet {
    min-height: 220px;
  }
  .pv-paper,
  .hero .pv-paper {
    padding: 16px 18px 30px;
  }
  .hero .pv-ribbon {
    height: 34px;
    font-size: 10.5px;
  }
  .hero .pv-paper h3,
  html[lang='zh-CN'] .hero .pv-paper h3 {
    font-size: 1.25rem;
  }
  .hero .pv-tab { height: 34px; }
  .pv-canvas {
    padding: 14px;
    min-height: 180px;
  }
    .pv-controls {
    flex-wrap: wrap;
    gap: 8px;
  }
  .pv-theme {
    margin-left: 0;
  }
  .hero-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .lang {
    display: none;
  }
  .mobile-langs {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px solid var(--rule-soft);
  }
  .mobile-langs a,
  .mobile-langs button {
    padding: 6px 10px;
    font-size: 12.5px;
    color: var(--ink-3);
    border-radius: 2px;
  }
  .mobile-langs a:hover,
  .mobile-langs button:hover {
    background: var(--paper);
    color: var(--ink);
  }
  .nav,
  .masthead-tools .btn {
    display: none;
  }
  .masthead-inner {
    height: 60px;
    gap: 16px;
  }
  .mobile-nav {
    display: block;
  }
  .masthead-tools {
    margin-left: auto;
    gap: 14px;
  }
  .feat {
    grid-template-columns: minmax(0, 1fr);
  }
  .feat-item:nth-child(2) {
    border-top-color: var(--rule-soft);
  }
  .shots {
    grid-template-columns: minmax(0, 1fr);
  }
  .center-row {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: 12px;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }
  .center-shot {
    flex: 0 0 82%;
    scroll-snap-align: start;
  }
  .center-note {
    text-align: left;
  }
  .faq summary {
    grid-template-columns: minmax(0, 1fr) 20px;
    gap: 18px;
  }
  .faq summary .faq-n {
    display: none;
  }
  .faq-a {
    padding-left: 0;
    padding-right: 20px;
  }
  .foot-mark {
    font-size: clamp(2.2rem, 11vw, 3.4rem);
  }
  .foot-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .steps {
    grid-template-columns: minmax(0, 1fr);
  }
  .step + .step {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--rule-soft);
  }
  .step {
    padding-block: 18px;
  }
  .dl-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
  .spec-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 11px 0;
  }
  .spec-row dd {
    text-align: left;
  }
}